Piston metro turbo mega 9.4cr +40 only 9.38cc dish

Sold as a single piston and although for Turbos is from original Rover casting and tooling to run on 5psi turbo boost. Now with 9.38cc. They use our mega ringset C-AJJ3379-40. If using more boost you need to be working on a lower CR with a total cylinder volume of 55cc in piston/block/head gasket and cylinder head.Also when increasing boost pressures it is essential to have a modified ignition advance/retard curve to prevent detonation and ensure the inlet charge temperature does not exceed 40 degrees C by the fitment of a suitable intercooler. If our advice is not followed it is very likley you will break the ring lands on your new pistons.